Cactus Christmas tree



FIG. 1 is a front view of a cactus Christmas tree showing my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof; and,

FIG. 5 is an enlarged bottom plan view thereof.

The broken line showing in FIG. 5 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a cactus Christmas tree, as shown and described. 